The Constructed Language Hypothesis

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Similarly, verbose ciphers that heavily depend on spaces like that You are not allowed to view links. Register or Login to view. are ruled out. But verbose ciphers can be designed in such a way that space ambiguity is not a problem (e.g. by avoiding cipher sequencies sharing the same prefix).

Yes. Spaces may be both meaningful, as separators between functional units, and useless because they can be reliably restored thanks to a rigid positioning rule (partial relation order), so it is possible that a lot of them were omitted to make Voynichese look more like a natural languages, with longer words: that could be intentionally misleading. On the other hand it is possible that scribes just didn't care, because they knew that the functional units were safe, they could be identified with or without spaces. Just like the spaces in "de cujus" and "in terra" could be omitted because decujus and interra are not Latin words and there is only one way to insert a space that produces two words, so there is no ambiguity.